ZL50212 Datasheet, PDF (1/42 Pages) Zarlink Semiconductor Inc – 288 Channel Voice Echo Canceller

Features
• ZL50212 has nine Echo Voice Processors in a
single BGA package. This single device provides
288 channels of 64 msec echo cancellation or 144
channels at 128 msec echo cancellation
• Each Echo Voice Processor has the capability of
cancelling echo over 32 channels
• Each Echo Voice Processor (EVP) shares the
address bus and data bus with each other
• Fully compliant to ITU-T G.165, G.168 (2000) and
(2002) specifications
• Passed all AT&T voice quality tests for carrier
grade echo canceller
• The ZL50212 provides more than 63% board
space savings when compared with the nine Echo
Voice Processors packaged devices
• Each EVP has a Patented Advanced Non-Linear
Processor with high quality subjective performance
• Each EVP has protection against narrow band
signal divergence and instability in high echo
environments
• Each EVP can be programmed independently in
any mode e.g. Back-to-Back or Extended Delay to
provide capability of cancelling different echo tails.
• Each EVP has 0 to -12 dB level adjusters at all
signal ports (Rin, Sin, Sout and Rout)
• Each EVP has the same JTAG identification code
ZL50212
288 Channel Voice Echo Canceller
Data Sheet
March 2003
Ordering Information
ZL50212GB 535 - Ball BGA
-40°C to +85°C
Applications
• Voice over IP network gateways
• Voice over ATM, Frame Relay
• T1/E1/J1 multichannel echo cancellation
• Wireless base stations
• Echo Canceller pools
• DCME, satellite and multiplexer system
Description
The ZL50212 Voice Echo Canceller implements a cost
effective solution for telephony voice-band echo
cancellation conforming to ITU-T G.168 requirements.
The ZL50212 architecture contains 144 groups of two
echo cancellers (ECA and ECB) which can be
configured to provide two channels of 64 milliseconds
or one channel of 128 milliseconds echo cancellation.
This provides 288 channels of 64 milliseconds to 144
channels of 128 milliseconds echo cancellation or any
combination of the two configurations. The ZL50212
supports ITU-T G.165 and G.164 tone disable
requirements.
Rin1...Rin9
Sin1....Sin9
D0....D7
CS1..CS9
A0..A12
RESET1..RESET9
ZL50212GB
EVP1 EVP2 EVP3
EVP4 _EVP9 EVP5
EVP6 EVP7 EVP8
Rout1..Rout9
Sout1..Sout9
IRQ1..IRQ9
DTA1..DTA9
Figure 1 - ZL50212 Device Overview
1